cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   Gillies
   Member

   Hello

   I am using particles for short bursts on impacts, a shower of leaves from a tree for example.
   I have created my particle definition using ParticleDesigner, and I have just moved my particle system onto a CCParticleBatchNode.

   One thing that has struck me is that on both ParticleDesigner and in Cocos2d, duration of the effect doesn't seem to be handled very well.
   For example, if I want to emit 33 particles for a single frame (a duration of 0.033) with a particle lifetime of 2 seconds, I need to create 2000 particles!
   This only became clear to me when my little pool of 3 leaf-emitters required the CCParticleBatchNode texture atlas to be resized to 6000.

   Does anyone know if I am doing something completely wrong here or should CCParticleSystem be optimised for when duration < life?

   Posted 6 months ago #
2. 

   hactar
   Member

   When I was implementing my ccparticles for Zen Wars (non batch node, didnt exist back then) I had to heavily tweak the number of particles, duration and life to more sane values to achieve the performance I needed.

   I strongly suggest taking the ParticleDesigner stuff as a starting point, but then adjusting the number of particles, the duration, the life and the scale to achieve the same effect with less particles on screen. It can easily be done, you just need to play with the numbers.

   Posted 6 months ago #
3. 

   Birkemose
   Moderator

   You should of course only set number of particles to the max visible number of particles that you need at any given point. In your case 33.
   You then basically set a high emitter rate, so that all particles are fired more or less all at once, and so that the the particle system "runs out of particles"

   This is how you simulate explosions etc etc.
   Last time I checked, particle designer didn't support this behavior.

   Posted 6 months ago #
4. 

   Gillies
   Member

   Great, thanks guys.
   Very handy to know how others have approached this.

   Posted 6 months ago #

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